CODEWITHSUNDEEP
command-linef#
zell
zell

Reputation: 10204

How to run an EXE file compiled from a F# source on the Mac Terminal?

I have a hello world program in F#.

open System

[<EntryPoint>]
let main argv =
    printfn "Hello World from F#!"
    0 // return an integer exit code%

On an Mac OS, I can compile it with "fsharpc", which generates two files

FSharp.Core.dll hello.exe

The EXE file certainly looks strange on a Mac. But how can I execute it from the command line, without using a project structure (because it seems an overkill) like what is explained here: https://dotnet.microsoft.com/learn/languages/fsharp-hello-world-tutorial/create

Actually if I run "dotnet hello.exe", I get this error:

A fatal error was encountered. The library 'libhostpolicy.dylib' required to execute the application was not found in '/Users/zell/hello/'. Failed to run as a self-contained app. If this should be a framework-dependent app, add the /Users/zell/hello/hello.runtimeconfig.json file specifying the appropriate framework.

Upvotes: 1

Views: 277

Answers (2)

Carl Walsh
Carl Walsh

Reputation: 6949

By trial and error, I found to run my new .exe file, I needed a .runtimeconfig.json file in the same folder with same without-the-extension-name, i.e. hello.runtimeconfig.json:

{
  "runtimeOptions": {
    "tfm": "net5.0",
    "framework": {
      "name": "Microsoft.NETCore.App",
      "version": "5.0.0"
    }
  }
}

Then dotnet hello.exe will work.

Upvotes: 0

Phillip Carter
Phillip Carter

Reputation: 5005

You can create and build/run F# apps like so:

dotnet new console -lang F# -o SomeDirectory && cd SomeDirectory
dotnet run

Building it without running is:

dotnet build

You can see a reference for all commands here: https://learn.microsoft.com/en-us/dotnet/core/tools/dotnet

You appear to have Mono installed, which is where fsharpc comes from. I wouldn't recommend using that unless you are doing mobile development with Xamarin, which currently requires Mono.

Upvotes: 2

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